Which of the following travels faster?
Speed of light in air is 3,00,000 km/s which is much faster than speed of sound, jet airplane and supersonic planes.
Braille system is used by
Braille system is used by blind people. It consists of dots which are touched by blind people to read the writing.
_________ refers to collection of rays.
Beam is collection of rays originating from a source of light.
Light always travels in straight line. This property is called
Light always travels in straight line. This property is called rectilinear propagation of light.
What makes the object visible?
Light makes the object visible. In absence of light we are not able to view the object present in our surrounding.
Mirror reflection gives us
Reflections are usually caused by shiny things, such as mirrors that show a reversed image of whatever is placed in front of them.
Angle of incidence is always
During reflection of light, angle of incidence is always equal to angle of reflection.
From a source light travels as rays which are
From a source light travels as rays which are parallel beam of light. Light always travel in straight line.
Perpendicular at the point of incident of light to the surface is called normal. Normal is an imaginary line.
In a plane mirror image formed is
In plane mirror, image is formed is always virtual and erect and equal in height. It also shows lateral inversion.
The mirror used as rear view mirror in vehicle is
Convex mirror is used as rear view mirror in vehicle as convex mirror form virtual and erect image of smaller size to cover large view filed.
A number of rays from different direction assemble at point are called
When a number of rays from different direction assemble at one point are called as convergent rays.
The angle of reflection is equal to the angle of incidence
During reflection of light, the angle of reflection is always equal to angle of incidence.
Light travels in which direction?
Light travels in straight line. This kind of travelling of light is called as rectilinear propagation of light.
Which of the following object will produce regular reflection?
Regular reflection is produced by smooth and polished surface like mirror. The reflected rays of light are always parallel to each other in regular reflection.
If you stand before a plane mirror, your left hand appears right. This phenomenon is
In plane mirror, left sided object appear right sided. This phenomenon of changing side is called lateral inversion of light.
Which of the following have reflecting surface?
Mirrors have reflecting surface because one side of mirror is painted with silver bromide.
__________ refers to collection of rays.
Collection of rays originating from a source of light and moving parallel to each other is called beam of light.
Which of the following substance change the direction of light?
Mirror is a reflecting object that changes the direction of light falling on it. Lens, thin plastic sheet and water are transparent and allow light to pass through it.
Which of the following statement is correct: